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Iridoid glycosides from fruits reduce the growth of fungi associated with fruit rot

Journal of Plant Ecology 2016年第3期9卷 357-366页

作者： Susan R.Whitehead Jordan Tiramani M.Deane Bowers Department of Ecology and Evolutionary Biology University of Colorado BoulderBoulderCO 80309USA Department of Entomology Cornell UniversityIthacaNY 14853USA Museum of Natural History University of Colorado BoulderBoulderCO 80309USA

Aims Ripe,fleshy fruits generally function as rewards to attract mutualistic seed dispersers,but many fruits also contain high concentrations of toxic secondary *** compounds may serve a variety of adaptive roles in seed dispersal or as a defense against non-dispersing seed predators or *** tested the effects of iridoid glycosides from fruits of a hybrid bush honeysuckle,Lonicera×bella,on the growth of two pathogenic fungal strains associated with fruit rot,Alternaria tenuissima and Aspergillus *** Fungi were isolated from field-collected L.×bella fruits and identified using molecular *** growth rates were assessed in vitro in the presence of varying concentrations of pure loganin,one of the most abundant iridoid glycosides in fruits,as well as fruit extracts containing a mix of at least seven different iridoid *** FindingsLoganin had strong dose-dependent negative effects on the growth of both *** from fruits had no effect on Aspergillus but a strong antifungal effect on Alternaria that increased with fruit *** iridoid glycoside concentrations in extracts were not good predictors of variation in fungal growth,but several individual compounds had significant negative *** iridoid glycosides have primarily been studied as antiherbivore defenses in leaves,these results indicate that they can also function to reduce the growth of fungi associated with fruit rot.

关键词： Caprifoliaceae fruit rot fruit secondary metabolites generalized defense Lonicera plant-pathogen interactions

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